“ The big difference between Sigma-Delta Dacs and the R-2R resistor ladder DAC is that rather than having feedback loops and high frequency oversampling clocks to produce an approximation of the digital data, the R-2R DAC will turn on each required bit in the digital "word", and the exact amount of current will flow from the chip, to reconstruct the analog waveform. The method is perfect in its simplicity, and this is reflected in the sound quality ” Check out our article on R-2R vs Sigma Delta DAC's here: